Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
0 votes

In an AP, the $\; 4^{th}\;$ term is $36$. The$\; 21^{st}\;$ term is $108$ more than the $\;9^{th}\;$ term. What is the first term a and the common difference $d$?

$\begin{array}{1 1} a=15,d=12 \\ a=9,d=9 \\ a=5,d=10 \\ a=3,d=21 \end{array}$

Can you answer this question?

1 Answer

0 votes
Answer : (b) a=9 , d=9
Explanation :
answered Jan 19, 2014 by yamini.v

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App